18566969 has 2 divisors, whose sum is σ = 18566970. Its totient is φ = 18566968.

The previous prime is 18566963. The next prime is 18566983. The reversal of 18566969 is 96966581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10156969 + 8410000 = 3187^2 + 2900^2 .

It is a cyclic number.

It is not a de Polignac number, because 18566969 - 2¹⁶ = 18501433 is a prime.

It is a super-2 number, since 2×18566969² = 689464675693922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18566963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9283484 + 9283485.

It is an arithmetic number, because the mean of its divisors is an integer number (9283485).

Almost surely, 2^18566969 is an apocalyptic number.

It is an amenable number.

18566969 is a deficient number, since it is larger than the sum of its proper divisors (1).

18566969 is an equidigital number, since it uses as much as digits as its factorization.

18566969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 699840, while the sum is 50.

The square root of 18566969 is about 4308.9405890543. The cubic root of 18566969 is about 264.7973721000.

The spelling of 18566969 in words is "eighteen million, five hundred sixty-six thousand, nine hundred sixty-nine".